Release 0.3b6

This release brings improved note-taking behavior. VGStash will now tell
you whether notes changed or not after you're done with editing them.
This improves scrollback usability.

Additionally, some changes in the README. Mostly of tone, but also
removing the "don't use this unless you're developing it" message. I
feel that is more welcoming and better communicates that I think it's
ready to be used by others.

So, give it a shot and let me know how it went.
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